• 제목/요약/키워드: Positioning stages

검색결과 59건 처리시간 0.023초

측위 정확도 향상을 위한 복합 IPS 시스템 설계 (Design of complex IPS system to improve positioning accuracy)

  • 이현섭;김진덕
    • 한국정보통신학회논문지
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    • 제21권10호
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    • pp.1917-1922
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    • 2017
  • WPS는 현실세계에 산재한 무선 신호를 활용하여 측위를 수행한다. 측위 위치의 무선 신호 정보를 수집하여 radio map을 구성하는 구축단계, 구성된 정보와 수집된 무선 신호를 비교하는 측위 단계로 나누어진다. WPS는 측위 시 수집된 신호에 변화가 나타날 경우 측위 정확도의 하락을 가지고 온다. PDR은 관성 센서들을 활용하여 보행자의 걸음걸이 수, 이동거리, 방향을 분석하여 최종 이동지를 분석하는 시스템이다. WPS의 측위 결과가 두 개 이상의 위치로 나타날 경우 측위 정확도의 문제로 판단할 수 있다. 몇몇의 조건에서 문제가 발생하게 된다. 본 논문에서는 앞서 언급한 문제점이 발생하는 상황에 대하여 분석하고 이를 PDR을 통해서 보정하는 시스템에 대하여 제안한다. 이 복합측위를 적용할 경우 WPS에 문제가 발생할 경우에도 측위 정확도를 유지하거나 향상 시킬 수 있을 것으로 사료된다.

초정밀 위치 결정을 위한 이중 서보 제어용 미세 구동 메카니즘 (A Fine Motion Mechanism of Dual Servo Control for Ultraprecision Positioning)

  • 오정석;이창우;이형석;김승우
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1993년도 추계학술대회 논문집
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    • pp.249-254
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    • 1993
  • In order to respond to the increasing demands of ultraprecision positioning mechanism in the field of precision engineering, more accurate stages are needed whose positioning uncertainty should be in the unprecedented level of nanometers, while maintaining a long travek range. For this application, most conventional stage mechanisms are found not suitable, so the concept of dual servo, which uses two different servos, is one of the new design and control strategies being extensively investigated these days, This paper presents a fine motion mechanism as a part of research on the dual servo control. The stage is made of a single structure of elastic flexure, whose xy .theta. motions are induced in the form of elastic deformation activated by three piezoelectric actuators. Experimental results show that the translational and rotational motions of the stage can be controlled with resolutions of 5 nm and 0.1 arcsec, respectively.

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위성기반 보강항법시스템 기술 동향 (Technology Trends of Satellite Based Augmentation Systems)

  • 김정래;김용래;김종윤
    • Journal of Positioning, Navigation, and Timing
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    • 제13권1호
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    • pp.25-34
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    • 2024
  • The Satellite Based Augmentation System (SBAS) improves the accuracy and reliability of user positioning by transmitting the error correction and integrity information of the global navigation satellite system signal from geostationary satellites in real time. For this reason, SBAS was designed for aircraft operations and approach procedures and is now in operational or development stages in many countries. Time has passed since the construction of SBAS and many changes have occurred in the composition of the monitoring stations and the geostationary satellites. These changes have been investigated and the current operation and development status of SBAS globally are surveyed. The development and test schedules for the transition to dual frequency multi-constellation, an important topic in SBAS, are discussed.

초정밀 자기부상 스테이지의 위치제어를 위한 영구자석형 선형 자기베어링의 개발 (Permanent Magnet Biased Linear Magnetic Bearing for High-Precision Maglev Stage)

  • 이상호;장지욱;김의석;한동철
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2001년도 춘계학술대회논문집B
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    • pp.164-169
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    • 2001
  • The active magnetic bearing has many advantages - an active positioning, no contact and lubrication free motion - and is widely used in high precision motion stages. But, the conventional magnetic bearings composed of electromagnets only are power consuming due to their bias current and have the excessive heat generation, which can make the repeatability of the positioning system worse. To overcome this drawback, we developed a novel permanent magnet (PM) biased linear magnetic bearing for a high precision magnetically levitated stage. The permanent magnets provide a bias flux and generate a bias force, and the electromagnet increases or reduces a flux of the permanent magnets and gives a levitation force. This paper presents a theoretical magnetic circuit analysis, FEM analysis and experimental data from the 1-DOF tests, and compares the theoretical power consumption of the electromagnetic bearings and the PM biased linear magnetic bearings. The PM biased linear magnetic bearing presented in this paper gives better load capacity but lower power consumption than a conventional electromagnetic bearing and will be adopted in our 6-DOF high precision linear positioning maglev stage.

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볼나사 구동 리니어 스테이지의 마그네틱 센서 위치결정 실험 (The Position Decision Experiment of Magnetic Sensor in Ball-screw Driven Linear Stage)

  • 차영엽
    • 제어로봇시스템학회논문지
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    • 제19권1호
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    • pp.10-14
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    • 2013
  • High precision machining technology has become one of the important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decision. Though ball-screw driven linear stages equipped linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decision if they have not equipped the accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a magnetic sensor as a home switch of ball-screw driven linear stage by using capacitance probe.

홀 센서와 포토 센서를 이용하는 선형 스테이지에서 위치결정 비교 실험 (The Position Decision Comparison Experiment of Hall and Photo Sensors in the Linear Stage)

  • 차영엽
    • 제어로봇시스템학회논문지
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    • 제21권2호
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    • pp.157-161
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    • 2015
  • For machining systems having a high precision positioning with a long stroke, it is necessary to examine the repeatability of reference position decisions. Though ball-screw driven linear stages equipped with encoders have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped accurate home sensors. High precision machining technology has become one of the most important aspects of the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. This study is performed to experimentally compare the repeatability for home position decisions in the case of photo sensors and hall sensors as a home switch of the ball-screw driven linear stage.

광소자 정렬용 극초정밀 다축 위치 제어장치 개발 (Development of Multi-axis Nano Positioning Stage for Optical Alignment)

  • 정상화;이경형;차경래;김현욱;최석봉;김광호;박준호
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2004년도 추계학술대회 논문집
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    • pp.304-307
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    • 2004
  • As optical fiber communication grows, the fiber alignment become the focus of industrial attention. This greatly influence the overall production rates for the opto-electric products. We proposed multi-axis nano positioning stage for optical fiber alignment. This device has 3 DOF translation and sub nanometer resolution. This nano stage consist of 3 PZT-driven flexure stages which are stacked parallel. The displacement of it is measured with capacitance gauge and is controlled by computer-embedded main controller. The design process of flexure stage using FEM is proposed and the performance evaluation of this system is verified with experiments.

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포토 마이크로 센서를 이용한 볼나사 구동 리니어 스테이지의 위치결정 실험 (A Position Decision Experiment in Ball-screw Driven Linear Stage using a Photomicrosensor)

  • 차영엽
    • 제어로봇시스템학회논문지
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    • 제20권4호
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    • pp.463-467
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    • 2014
  • High precision machining technology has become one of the most important parts in the development of a precision machine. Such a machine requires high precision positioning as well as high speed on a large workspace. For machining systems having high precision positioning with a long stroke, it is necessary to examine the repeatability of the reference position decision. Though ball-screw driven linear stages equipped with linear scale have high precision feed drivers and a long stroke, they have some limitations for reference position decisions if they have not been equipped with an accurate home sensor. This study is performed to experimentally examine the repeatability for home position decision of a photo micro sensor as a home switch of a ball-screw driven linear stage by using a capacitance probe.

3D 프린터 기반 수직형 마이크로 모션 스테이지의 최적설계 (Optimal Design of 3D Printer based Piezo-driven Vertical Micro-positioning Stage)

  • 김정현
    • 로봇학회논문지
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    • 제12권1호
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    • pp.78-85
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    • 2017
  • This paper presents the development of a 3D printer based piezo-driven vertical micro-positioning stage. The stage consists of two flexure bridge structures which amplify and transfer the horizontal motion of the piezo-element into vertical motion of the end-effector. The stage is fabricated with ABS material using a precision 3D printer. This enables a one-body design eliminating the need for assembly, and significantly increases the freedom in design while shortening fabrication time. The design of the stage was optimized using response surface analysis method. Experimental results are presented which demonstrate 100nm stepping in the vertical out-of-plane direction. The results demonstrate the future possibilities of applying 3D printers and ABS material in fabricating linear driven motion stages.